The 10,000 Year Explosion: How Civilization Accelerated Human Evolution. Gregory Cochran and Henry Harpending. Basic Books. © 2009.
ABC et Cetera: The Life and Times of the Roman Alphabet. Alexander & Nicholas Humez. David R. Godine, Publisher. © 1985.
Alpha Beta: How Our Alphabet Saved the Western World. John Man. Headline Book Publishing. © 2000.
The American Heritage Dictionary of Indo-European Roots. Calvert Watkins, Editor. Houghton Mifflin Company. © 1985.
The Adventure of English: The Biography of a Language. Melvyn Bragg. Arcade Publishing. © 2003.
Barbarian Rites: The Spiritual World of the Vikings and the Germanic Tribes. Hans-Peter Hasenfratz, Ph.D. Inner Traditions. © 1992.
Greek and Latin in English Today. Richard M. Krill. Bolchazy-Carducci Publishers. © 1990.
The History of English: A Linguistic Introduction. Scott Shay. Wardja Press. © 2008.
The Horse The Wheel and Language: How Bronze-Age Riders from the Eurasian Steppes Shaped the World. David W. Anthony. Princeton University Press. © 2007.
In Search of the Indo-Europeans. J.P. Mallory. Thames and Hudson. © 1989.
The Invasion of Europe by the Barbarians. J.B. Bury. W.W. Norton & Company. © 1967.
Inventing English: A Portable History of the English Language. Seth Lerer. Columbia University Press. © 2007.
A Mighty Fortress: A New History of the German People. Steven Ozment. Harper Collins. © 2004.
The Merriam-Webster New Book of Word Histories. Merriam-Webster, Inc. ©1991.
The Origins and Development of the English Language. 5th Edition John Algeo and Thomas Pyles. Thomson Wadsworth. © 2004.
The Story of English. Robert McCrum, William Cran, and Robert MacNeil. Penguin Books. © 1986.
The Unexpected Evolution of Language. Justin Cord Hayes. F+W Media, Inc. © 2012.